IIARD International Institute of Academic Research and Development

International Journal of Agriculture and Earth Science (IJAES )

E- ISSN 2489-0081
P- ISSN 2695-1894
VOL. 9 NO. 4 2023
DOI: https://doi.org/10.56201/ijaes.v9.no4.2023.pg115.126

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Responses of Two Life Stages of Oreochromis niloticus to Acute Toxicity of Ridoff (Organophosphat Insecticide)

Uedeme-Naa, B; Opara, J.Y ; John-Amadi, S.V and Onokpasa, S

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Abstract

The acute toxicity of Ridoff (Insecticide dichlorvos) on two life stages of Oreochromic niloticus of mean standard length and weight (fingerlings - 4.20 ± 0.60 cm and weight - 7.00±0.20g and juveniles - 12.04 ± 0.20cm and 14.04±0.05g) were investigated under laboratory condition at the concentrations of 0.05, 0.08, 0.10, 0.13 and 0.15ml/l. All the physicochemical parameters (ammonia, dissolved oxygen, pH, temperature and nitrite) under consideration were within acceptable limits. LC50 of Ridoff was calculated at 24, 48, 72 and 96 hours using probit test. Mortality was observed in all treatments of the two life stages exposed from 0.08mg/l at 96 hours. In the first life stage (fingerlings), LC50 was 0.058 within 24 and 96hours and the second life stage (post fingerlings) LC50 was 0.019 within 24 and 96 hours. At a close watch the two life stages exhibited agitated swimming, loss of equilibrum, air gulping, period of quiescence, and turned on flank and swarm in circles and finally died. Accumulation of mucus also was observed on the gill filaments and body surface of the dead fish on exposure to toxicant. Ridoff (Dichlorvos) indeed is harmful to Oreochromis niloticus, which could be a non-target organism in an aquatic ecosystem

keywords:

Acute toxicity, dichlorvosl, behaviour, Oreochromis niloticus

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References:

Alan, M.K and Maughan, O.E.(1993). Acute Toxicity of selected organophosphorus pesticides
to Cyprinus carpio and Barilius vagra. Journal of Environment and Scientific health.
28(1):81-91.

Alan, M.K and Maughan, O.E.(1993). Acute Toxicity of selected organophosphorus pesticides
to Cyprinus carpio and Barilius vagra. Journal of Environment and Scientific health.
28(1):81-91.

Anees, M.A. (1978). Haematological abnormalities in a freshwater teleost, Channa punctatus,
exposed to sub-lethal and chronic levels of three organophosphorus insecticides.
International Journal of Ecology and Environmental Sciences

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